FRONT PANEL CALIBRATION POINTS (continued)
VU ADJUST - CALIBRATION PROCEDURE:
VU ADJUST is calibrated in dBu. The trimmer has a wide enough range that “0” can be cali-
brated to virtually any reference level. Factory setting is 0dB = +10dBu (2.45VAC).
•
Set PEAK REDUCTION & LIMITER RESPONSE fully-counterclockwise.
•
Set OUTPUT LEVEL, LIMITER FEEDBACK fully-counterclockwise.
•
Allow 10 minutes system warm-up time and 1 minute rest from any peak reduction activity.
•
Adjust your tone generator to a 1kHz sine-wave @ +10dBu (2.45V). Verify level using an ex-
ternal DMM or suitable meter. If your DMM has a dB function, select that. If not, set to A/C
and read 2.45VAC.
•
Inject the sine-wave at the LINE input XLR and be sure to select LINE on the front panel.
•
Raise the OUTPUT LEVEL control until the external DMM is reading+10dBu and observe if
the VU METER reads 0dB across pins 2&3 of the OUTPUT XLR.
•
If not, adjust as necessary.
STEREO ADJUST - CALIBRATION PROCEDURE:
Located between VU ADJUST & GR ZERO ADJUST.
STEREO ADJUST is used to maintain proper stereo imaging during gain reduction, when using
two PAL Plus MkIII units. Please read the calibration procedure carefully and be sure you have
a thorough understanding before attempting this calibration.
•
Verify that ZERO ADJ, GR TRACK and VU ADJ are all calibrated. If not, follow the CALI-
BRATION PROCEDURE instructions for getting each of them to read accurately.
•
Set PEAK REDUCTION & LIMITER RESPONSE fully-counterclockwise.
•
Set OUTPUT LEVEL, LIMITER FEEDBACK fully-counterclockwise.
•
Set RATIO to 3:1.
•
Adjust your tone generator to a 1kHz sine-wave @ +10dBu (2.45V). Verify level using an ex-
ternal DMM or suitable meter. If your DMM has a dB function, select that. If not, set to A/C
and read 2.45VAC.
THE PAL PLUS MKIII
R e q u i s i t e A u d i o E n g i n e e r i n g! L2M MkIII
10
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